共查询到20条相似文献,搜索用时 125 毫秒
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在装置外侧进行中性粒子测量和中性束注入实验时,为了更好的屏蔽外部磁场,需要准确测定设备周围的磁场分布情况,即HL-2A装置的励磁线圈在装置外侧产生的杂散磁场的分布情况,本实验主要完成该分布的测量与分析,这对于以后装置外杂散磁场的测量与分析方法的改进完善也有其独立的意义。 相似文献
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雷击近场等强电场环境下的磁场测量是电磁脉冲测量技术中的难点之一,由于输出端结构的径向非对称性,传统的环天线很难避免电场干扰。针对于此,研制了一种基于双环差分结构的脉冲磁场传感器,该传感器由双环天线和光传输系统组成。根据近场电磁场量的分布特性,双环天线选择平行镜像对称放置的方式,从而能够将终端电压区分为磁场响应分量和电场响应分量,再通过末端差分电路即可去除电场响应分量,得到纯净的磁场响应分量。试验表明,在邻近雷击环境模拟装置中,双环传感器相较于单环传感器具备更强的抗电场干扰能力,能够实现磁场的准确测量。 相似文献
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利用等效源观点, 把钢铁建造的舰船船体视为等效磁荷面分布, 建立了该分布与磁场传感器测量值之间应满足的第一类Fredholm积分方程, 然后利用广义逆矩阵对积分方程离散化后得到的线性方程组进行求解, 并以矩阵条件数来衡量方程组的病态程度, 最后利用求解得到的磁荷分布来预测舰船在空间中任意点上产生的磁场. 数值模拟表明该方法可以准确地识别磁性从而得到精确的磁场预测值. 最后利用一个船模实验验证了本方法.
关键词:
舰船
磁场
磁荷
积分方程 相似文献
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智能磁场测量仪的原理和设计 总被引:2,自引:1,他引:1
阐述了基于光栅传感器和霍尔传感器以及单片机技术的智能化磁场测量仪的工作原理和设计方法.增加了光栅位移传感器测量位移,利用8032单片机内部功能,结合传感器技术,实现工作电流和励磁电流自动切换.该仪器可实现自动对螺线管内逐点霍尔电压和磁感应强度的实时测量以及清晰显示磁场分布曲线等功能. 相似文献
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介绍了脉冲弦线磁场测量方法的基本原理和实验装置,研究了脉冲电流宽度对测量结果的影响,观测到双波叠加的新现象。该现象很好地解释了零信号的产生原因,并由此可以确定测量磁场二次积分时的脉冲电流宽度。 相似文献
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利用毕奥萨伐尔定律,通过对EAST内部等离子体电流的运动状态的研究,建立了EAST内部的磁场数学模型,并利用Matlab对实验数据的拟合分析,对模型进行了分析验证。通过误差分析,进而改进模型,研究表明改进后的模型与实验数据能较好吻合,误差较小。相关研究和结论对托卡马克真空室内磁场测量具有一定的指导意义,为进一步研究基于MEMS技术的超导托卡马克装置电磁测量诊断系统的微纳磁敏传感器奠定理论基础。 相似文献
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亥姆霍兹线圈磁场分布及其测量 总被引:1,自引:0,他引:1
采用美国PASCO公司生产的"科学工作室"物理实验系统重新设计了亥姆雷兹线圈磁场实验,以定量分析的实验形式,弥补了传统方法测量亥姆霍兹线圈磁场的不足,同时也体现了PASCO科学工作室在实验数据采集方面具有传统方法不可比拟的优点。 相似文献
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Surface plasmon resonance (SPR) sensor chip is proposed for magnetic field monitoring in the infrared wavelength region. The structure is based on silicon substrate and gold as SPR-active metal used with an appropriate magnetic fluid film. The angular interrogation method has been used to study the sensor’s performance in terms of large shift and small width of the SPR curve for a wide range of magnetic field between 30 and 220 Oe. The effect of field incidence angle is also studied on the proposed sensor’s performance, and it is observed that the field should be incident as parallel to the magnetic fluid surface as possible. Any possibility of oxidation problem to the proposed SPR sensor is addressed by using a stable buffer layer. All the performance parameters were found to be significantly large for the above field incidence condition. The proposed sensor is able to achieve a resolution of the order as high as 0.18 Oe for magnetic field detection. 相似文献
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Using a nanoscale extraordinary hall effect sensor to measure the tip field of a magnetic cantilever
O. V. Kononenko S. I. Bozhko V. N. Matveev V. I. Levashov M. A. Knyazev V. T. Volkov 《Bulletin of the Russian Academy of Sciences: Physics》2014,78(9):826-828
The spatial distribution of the magnetic field around the tip of a magnetic cantilever coated with a cobalt film 50 nm thick is investigated using an FePt extraordinary Hall effect sensor. The magnetic field’s dependence on the distance between the sensor’s surface and the MFM cantilever is measured and found to be inversely proportional to the cubic distance, as predicted in theory. The magnetic field measured on the MFM cantilever tip is found to be 0.02 T. 相似文献
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Nuclear Magnetic Resonance (NMR) technique is widely used as a powerful tool to study the physical and chemical properties of materials. However, this technique is limited to the materials in condensed phases. To extend this technique to the gas-phase molecular ions, we are developing a gas-phase NMR apparatus. In this note, we describe the basic principle of the NMR detection for molecular ions in the gas phase based on a Stern-Gerlach type experiment in a Penning trap and outline the apparatus under development. We also present the experimental procedures and the results on the formation and the manipulation of cold ions under a strong magnetic field, which are the key techniques to detect the NMR by the present method. 相似文献